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Originally Posted by Orion
A 120v device submerged in the lake will have no effect on swimmers since the current is discharged and dissipated into the water which is a huge ground. The only way someone could get a shock is if someone handed them a wet pump with a leaky wire while they were standing in the water, thus completing a path to ground (the lake). This would also trip a GFCI CB. We have a sumberged 240v well pump as our water supply and I've actually only felt a slight tingle when touching the pump while running. I know that the wiring on those pumps is not watertight.
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Your comments are incorrect and dangerous. Someone could read your post and think you know what you are talking about. I think you should delete or edit your post.
There are things that must be kept away from each other for safety. Gasoline and fire is one example, high voltage and people in the water is another. Why use a 120 volt appliance in a swimming area when there are plenty of 12 and 24 volt models available that will be totally safe?
Try the link below to see what the Red Cross and the CPSC think about electricity and water.
http://www.cpsc.gov/cpscpub/prerel/prhtml03/03125.html